Post up your ported cylinder Artwork

[farminkarman]

It ain't what I first thought it was. I'm not sure....but I think......I'll let Greg guess. LOL

Dang it! I haven’t the slightest good guess… the base looks husky/Jred like. The exhaust port is very squared off…no idear

 

[huskihl]

@SOS Ridgerider would recognize it. Maybe @Wilhelm

 

[Mastermind]

@SOS Ridgerider would recognize it. Maybe @Wilhelm

Well I'm thinking Solo or Dolmar....

 

[srcarr52]

Start guessing……

Dolmar?

 

[Woodslasher]

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Looks kinda Echo-y to me, but the upper muff bolt hole says dolmar. I'mma say 6400 or one of the other smaller bores for that chassis.

 

[HYPERSAWS]

Start guessing……

One that f..king rips

 

[SOS Ridgerider]

@SOS Ridgerider would recognize it. Maybe @Wilhelm

It looks like a 73cc or 79cc Dolmar to me. Definitely not a 64cc, since that one’s an open port. My guess would be a 79cc, since that’s the most common to have ported. With that said, it’s either an original 7900, or the later oem 7901 labeled cylinder that came with the updated piston.

 

[huskihl]

It looks like a 73cc or 79cc Dolmar to me. Definitely not a 64cc, since that one’s an open port. My guess would be a 79cc, since that’s the most common to have ported. With that said, it’s either an original 7900, or the later oem 7901 labeled cylinder that came with the updated piston.

7900 is bottom fed…this is side fed

 

[srcarr52]

Dolmar/Makita 9000/9010

 

[huskihl]

Dolmar/Makita 9000/9010

Winner winner

 

[Wilhelm]

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With Kevin One must alway remember that the jugs are actually bigger than they look like whilst he is holding them!

I wouldn't have guessed what saw that cylinder goes to since I have never had a 9010 jug im my hands.

 

[Nutball]

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What numbers are you using? I'm trying around 98, 123, 82, hopefully will have it together and running in a couple weeks. Porting is done.

 

[huskihl]

What numbers are you using? I'm trying around 98, 123, 82, hopefully will have it together and running in a couple weeks. Porting is done.

I am at more like 120 on the transfers and 75 on the intake for starters.

 

[Nutball]

I ported mine for a shortish bar: 30" .404 full skip. I wonder if it would benefit from bridge ports to help push mix way up in the tall cylinder? I decided not to.

 

[huskihl]

I ported mine for a shortish bar: 30" .404 full skip. I wonder if it would benefit from bridge ports to help push mix way up in the tall cylinder? I decided not to.

If you played with transfer timing, direction, and area a little bit, bridges and fingers won’t help you much

 

[Mastermind]

I ported mine for a shortish bar: 30" .404 full skip. I wonder if it would benefit from bridge ports to help push mix way up in the tall cylinder? I decided not to.

I don't use them anymore. I think hitting the right numbers is more important.

That said.....my "right numbers" may not be right for you.

On a long stroke engine, I do lean towards a higher exhaust than I would on a shorter stroke.

 

[Nutball]

 

[srcarr52]

I am at more like 120 on the transfers and 75 on the intake for starters.

On the one I did I was at 99/119/80. That was 9 years ago, I'd probably go a tiny bit longer on the exhaust now days and maybe even less blowdown.

 

[srcarr52]

And then there was this thing! 58mm bore 9000, the way it should have came. @Black Dog Chainsaw

 

[NPKenny]

@Nutball

Please discuss your dimpled intake. I know this has been covered in the past but I didn't realize it was still being incorporated into builds.